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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - Superimposed text while editing cells makes cells unreadable"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=113678">113678</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Superimposed text while editing cells makes cells unreadable
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>5.2.6.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Calc
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>philippe@hemmel.fr
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=137572" name="attach_137572" title="video showing the behavior during editing">attachment 137572</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=137572&action=edit" title="video showing the behavior during editing">[details]</a></span>
video showing the behavior during editing

This occurs systematically in this context : 

- Debian 8 jessie, whatever the version of the graphic card driver
- PC with 5th generation Intel CPU (Broadwell) and not with 4th generation
intel CPU (Haswell)
- big spreadsheets (size > 5 Mb)
- LibreOffice 5.2.x, 5.3.x, 5.4.2

The small video attached shows what users see.

Some tests have been done :
- Enabling OpenGL improves the behavior but Calc becomes very slow, so slow
that it can't be the answer
- the redraw function fixes the display
- disabling AutoInput improves the behavior, because no other word is displayed
below the words typed. But users need AutoInput and it doesn't really solve the
problem.
- aggravating factor : centering text in a cell makes the cell completely
unreadable while editing

This bug is maybe linked to this one : 

<a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED WORKSFORME - EDITING - Text display "doubles" on top of itself when deleting letters/numbers in a cell"
   href="show_bug.cgi?id=108812">https://bugs.documentfoundation.org/show_bug.cgi?id=108812</a></pre>
        </div>
      </p>


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